Scar at 3.5 Weeks Looking Worse?

My son crushed open the tissue on his chin, 4 weeks ago (in 2 days) he had absorbable stitches inside, non absorbable (6) outside. He also got some road rash. It looked great about 1 week after stitches were out. Almost 3 weeks after, it looks more red/pink. He is 3yrs old and picked up a cold. I'm worried its getting infected now? Is that possible at this point. No fever, it doesn't feel warm, but it looks more pink and red than it did a week ago? Is this normal?